Export: flush-right date rail can overlap a long one-line experience header (round-trip-safe fix)

[s-annam]

Problem

The flush-right role/degree date rail added in #425 (render-ats-pdf.ts drawText rightText) can be overdrawn by a long one-line experience header. The date is drawn at x = PAGE_WIDTH - MARGIN - dateWidth, but the left header text wraps against the full CONTENT_WIDTH, so a long flagship-shape header — Title · Company, Location · Team — whose first line extends past 558 - dateWidth renders on top of the date.

Surfaced by Samhit in review of PR #434 (thread on render-ats-pdf.ts:603).

Why the obvious fix regresses the round-trip invariant

The natural fix — reserve dateWidth + gap out of the first-line wrap budget so the header wraps before the date rail — breaks the parse → export → re-parse round-trip (corpus-roundtrip.test.ts). Two fixtures regress with role[0].company dropped:

• unknown/student-projects-activities-singlecol.pdf
• google-docs/google-docs-skia-proxy-additional-skills.pdf

Both carry a ·-delimited header that fits on one line at full width (visually overlapping the date) but the parser reads company off that single line. Forcing the header to wrap splits Title · Company across two lines and the company is lost on re-parse. Truncating the header (Samhit's alternative) alters the drawn text and regresses the round-trip the same way.

So the overlap is purely visual (the parser ignores glyph position — the round-trip was fine with the overlap), and every text-altering remedy trades a cosmetic bug for a correctness regression.

Durable fix (needs both sides)

1. Render: keep the header on one line and auto-fit the font size (shrink the left text to clear the date rail, down to a floor) so no text is added/removed — round-trip-safe. Fall back to wrap only past the floor.
2. Parser: teach the experience-header extractor to rejoin a wrapped ·-header so a wrapped export re-parses company correctly, unblocking the wrap path as a fallback.

Either alone is incomplete: (1) without (2) still wraps (and regresses) for very long headers past the shrink floor; (2) makes wrapping safe but auto-fit is the nicer visual.

Acceptance

• A long one-line Title · Company, Location · Team header + flush-right date renders with no overlap in the exported PDF.
• corpus-roundtrip.test.ts stays green — no role[0].* regressions.
• Add a render fixture/assert for the long-header + date-rail overlap case.

[s-annam]

Closing as completed by PR #551 (#436): wrapReservingRight in src/lib/pdf/render-ats-pdf.ts re-wraps only a header that would overrun the date column, atomically, and render-roundtrip.repro.test.ts pins it. The parser half landed in #495/#505/#551. A standalone render-only no-overlap assertion, if wanted, should be filed fresh.